tree fa46b270a8579e034fbe53b967dba88d0b929cae
parent df2f4cb8883e4876ce9a13ce21340cf41390f324
author Shawn McCarney <shawnmm@us.ibm.com> 1729031689 -0500
committer Shawn McCarney <shawnmm@us.ibm.com> 1729614449 -0500

I2CInterface: Add process call methods

Add C++ methods to perform the following SMBus commands:
* Process Call
* Block Write-Block Read Process Call

For Block Write-Block Read Process Call, implement support for writes up
to 255 bytes. SMBus 2.0 supported a maximum of 32 bytes, and SMBus 3.0
supports a maximum of 255 bytes. The current Linux SMBus function only
supports 32 byte writes. Provide an alternate implementation using the
lower level I2C_RDWR ioctl() to support up to 255 bytes.

Tested:
* Verified Process Call worked correctly
* Verified Block Write-Block Read Process Call worked correctly
  * When using SMBus function
  * When using I2C_RDWR ioctl()
* Tested error cases
* See complete test plan at
  https://gist.github.com/smccarney/96eda4c7c11fe4f89e4491c768f76047

Change-Id: Icc1ba840741b1e26a50fe32bad8b2181a01dbb24
Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>